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- W2100833178 abstract "Based on the measurements of fluorescence intensity and alteration on a rank series of coals from China, the process of coalification ranging from peat to early volatile bituminous coal can be divided into four rank stages. The boundaries between adjacent stages lie at the vitrinite reflectances of 0.30%, 0.55% and in the range of 0.80–0.90% Rm, where striking fluorescence changes or jumps take place. The jump at 0.3% Rm, which has not been reported before, marks the boundary between soft and hard brown coals. The other boundaries correspond to the first and second coalification jumps described by Teichmüller and Durand (1983), and can be compared with the oil birth line and maximum generation. Fluorescence intensity of both huminites/vitrinites and sporinites generally decreases with increasing rank. Based on the correlation equations between vitrinite reflectance and fluorescence intensity established in this study, it is possible to predict coal rank or thermal maturity of organic matter with fluorescence intensity analysis. While the huminites/vitrinites and sporinites display a similar alteration rank trend: from negative, through positive and dual and negative again, at any given rank, the alteration patterns of sporinites and vitrinites are different from each other. With increasing rank, the change of alteration pattern of the huminites/vitrinites always takes place earlier than that of the sporinites." @default.
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- W2100833178 date "1993-08-01" @default.
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- W2100833178 title "Fluorescence intensity and alteration of coal macerals and their relation to coalification" @default.
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- W2100833178 doi "https://doi.org/10.1016/0146-6380(93)90053-e" @default.
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